Do you know of a place online where I can sell art commissions?

I'm trying to raise money to go on a trip and selling art commissions on the side to do so. (Someone tells me what they want me to draw and I draw it for them when they pay me). Selling them on deviantart is ok but as it is a community of artists, there are not many customers. I'm just wondering if there are any forums or communities out there where I might find someone interested.

Thanks!